Walking down a path through some woods in Georgia, I saw a water puddle (水坑) ahead on the path. I walk around to the side of the path that wasn't covered by water and1.As I reached the puddle, I was suddenly attacked! Yet I did nothing for it was so2I stepped back and my attacker stopped attacking me3attacking more, he flied in the air with its graceful4in front of me. Had I been hurt, I wouldn't have found it amusing but I was unhurt, it was5 and I was laughing. After all, I was being attacked by a butterfly!

    I took a step forward, and my attacker rushed me again. He pushed and 6.Me in the chest with his head and body over and over again with all his might. It's just not everyday that 7is attacked by a butterfly, so I stopped to find out the 8My attacker moved back as well to9 on the ground. That's when I discovered why my10was charging me only moments earlier. He had a mate beside the puddle11he landed and she was dying.

    Sitting close beside her, he opened and closed his wings as if to fan her. I could only12the love and courage of that butterfly in his concern for his mate, even though she was 13dying and I was so large. He did so just to give her those extra few 14moments of life. Now I knew why and what he was 15I couldn't do anything other than reward him by changing my 16 to the more difficult side of the puddle. He had truly 17 those moments to be with her, undisturbed. I cleaned the mud from my boots and left.

    Since then, I've always tried to remember the 18of that butterfly whenever I see huge 19 facing me. I use that butterfly's courage as an inspiration to 20myself that good things are worth striving for.

   I like my bike. It brings me a lot of fun. When I was an1boy, my father bought it for me. It is my “horse”. I often go to school2 my bike. I like riding a bike 3 it is very convenient. If I go out by bike, it is 4 to find a place for parking it. Bikes are very cheap, so most people can buy one. There are three people in my family. 5of us has a bike. My parents are teachers in my school. In the morning, Mum, Dad and I each 6 to school. However on a rainy day we walk to school, because the road is bad for riding. I think riding bikes can make us7 . It not only helps us exercise more but also 8 the air clean. The bike is very important in Chinese people’s life. So riding bikes can help you to 9 more about China and the Chinese people. Now people in the world say China is the country of bikes because there are 10 bikes in China. I hope people all round the world like them.

下列物质的性质与用途没有直接关系的是（　　）